IBM PC hacking

Tony Duell ard at
Tue Sep 27 17:32:48 CDT 2005

> Oh, another favorite feature:  The card had a signal line that could activate 
> the degaussing circuit on the bundled AT&T monitor.  I almost fell out of my 
> chair when I ran diagnostic software that printed something like 
> "Degaussing..." and then was quickly followed by a loud noise and the familiar 
> "twisty pix" distortion of a monitor in its degaussing cycle...  scared the 
> crap out of me.

I beleive the HP9845C (colour monitor) had a DEGAUSS command in the BASIC 
that would energise the degausing coil. And a CONVERGE command that would 
display the appropriate patterns for doing convergeance adjustments. Alas 
I only have a 9845B (with the enhanced mono monitor) so I cna't try them out.


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